On April 15, North Korea celebrated the Day of the Sun: The birthday of the founder of the country, Kim Il Sung. A notable no-show for the annual celebration: Kim’s grandson and current head of state, Kim Jong Un. This has led to several questions: Where is the 36-year-old Kim, why has he not been seen in public and what might that mean to the balance of power on the Korean peninsula? Here’s a look at the Kim dynasty: